I’m not familiar with PSVR and haven’t ever used it, but I think that if you can’t access the game through PSVR, then you can’t play it.
Of course, just try opening roblox in PSVR and see if it works, and if it doesn’t, there’s your answer.
However, looking at the PSVR controllers, I seriously doubt roblox would have support for it.
If you do have a computer however, you can install some software to make your PSVR headset work on your computer via SteamVR, and then play roblox VR on your computer.
Other than that, you’ll have to get a Quest or any other wireless VR headset that’s compatible with roblox.
My experience using roblox on my quest however was not good, and I would highly recommend using PC if you can as the VR app is riddled with bugs making it unusable in some cases.
(This was from a while ago, I use exclusively use PCVR now)